WebGL to cache Data before the first run

Hi, We have a presentation with a few pages before WebGL page starts that user is going through, so we would like to initiate download and cac$$anonymous$$ng of the large App.data.unityweb file w$$anonymous$$le on the very 1st page of that presentation. Unity WebGL doc: "Data cac$$anonymous$$ng Enable t$$anonymous$$s option to automatically cache your contents Asset data on the user’s mac$$anonymous$$ne so it doesn’t have to be re-downloaded on subsequent runs." And it is working after the 1st run. Is it possible for WebGL to cache Data App.data.unityweb before the first run?

Thanks a lot!